20021200121200 has 120 divisors (see below), whose sum is σ = 52265870405120. Its totient is φ = 7342239686400.

The previous prime is 20021200121191. The next prime is 20021200121303. The reversal of 20021200121200 is 212100212002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42254214 + ... + 42725413.

Almost surely, 2^{20021200121200} is an apocalyptic number.

20021200121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021200121200 is an abundant number, since it is smaller than the sum of its proper divisors (32244670283920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021200121200 is a wasteful number, since it uses less digits than its factorization.

20021200121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84979695 (or 84979684 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021200121200 its reverse (212100212002), we get a palindrome (20233300333202).

The spelling of 20021200121200 in words is "twenty trillion, twenty-one billion, two hundred million, one hundred twenty-one thousand, two hundred".